the sun can come through your window. >> right. so we're showing about 400 btus coming through this andersen window. >> that's extreme heat, right? >> right. it radiates in, builds up temperature on the floor. now we're showing between 40 to 50 btus. >> completely blocks it out. it's like a shield. so not only is it reflecting the heat, but in the wintertime keeps the heat in. >> that's correct. >> which is the key to this technology. >> well, the technology is so amazing. it was listed by popular science as one of the top 100 inventions of the millennium. that's how good it is. >> give us that offer one more time. >> well, for your viewers, for calling our total free number now, 1800-811-0466 or go to our website, eagleshield.com, they will now give that 15 point energy audit valued at $350, they will get it for free. and the first 200 callers that call right now, they will receive a space-age water heater blanket, same technology used in space, wrap around the water heater, it will double the hot water and give them literally a 2